ibm3206k0424 ETC-unknow, ibm3206k0424 Datasheet - Page 323

• Manufacturer Part Number: ibm3206k0424
• Description: Ibm Processor For Network Resources
• Manufacturer: ETC-unknow

Preliminary
used (that is, F4 End-to-end). There is a 16-bit mask field in the receive LCD. A description of each bit is in
the table below:
When an OAM cell is processed, the configuration information from the gpmtagE is used to make reassembly
decisions like which buffer pool or receive queue to use.
TCP/IP Receive Checksum Verification
When enabled, the IBM3206K0424 is able to perform verification of the IP header checksum and the associ-
ated protocol checksum for the user. The final checksum status is raised to the user in the packet header
flags. This function is accomplished by the RXCRC entity using the CRC nano-program.
To enable and use the function, several things must be done:
Note: Other types can be added if needed.
Once properly enabled, TCP/IP checksums are verified as packets arrive. The status is raised to the user in
the packet header using four bits of status (two bits for IP and two bits for protocol). The format and meanings
of the bits are specified in Packet Header. For connections that have mixed traffic, the checksum operation is
only run on packets that are recognized as TCP/IP. For example, on a LANE ETH connection packets of
different protocols can be interleaved.
pnr25.chapt05.01
August 14, 2000
• TCP/IP checksum function must be enabled in the REASM Mode Register. This enables the overall func-
• Specify a frame type in the frameType field of the receive LCD. This field specifies an entry point into the
tion and includes the checksum state words in the receive portion of the LCD.
checksum verification nano-code. The entry point points to a piece of code that understands how to
locate the IP header based on the current frame type. For example, a connection might be native IP over
ATM or LANE ETH. For the currently supported types, see the crc.txt file provided with the RXCRC code
load.
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Reserved
F4 segment
F4 End to End
F5 Segment
F5 End to End
Rm Forward Cell
Rm Backward Cell
Pti Reserved Cell
End to End Alarm
Segment Alarm
End to End Loopback
Segment Loopback
End to End Pm Cell
Segment Pm Cell
End to End Activate/Deactivate Cell
Segment Activate/Deactivate Cell
Description
IBM Processor for Network Resources
Cell/Packet Re-assembly (REASM)
Page 323 of 676
IBM3206K0424